Attachment for drill-wrenches.



No. 725,267. PATENTED APR. 14, 1903.

E. G. MILLER. ATTACHMENT FOR DRILL WRENGHES.

APPLICATION FILED APR. 17, 1902.

N0 MODEL.

.3 I9 29 0 I8 I/ IIIIIIII/ NITED FFICEm ATTACHMENT FOR DRILL-"WRENCHES.

SPECIFICATION forming part of Letters Patent No. 725,267, dated April14, 1903 Application filed April 17,1902. $erial1lo. 103,405. (Nomodel.)

To aZZ whom it may concern.-

Be it known that I, EDWIN CLARENCE MIL- LER, a citizen of the UnitedStates, residing at Laharpe, in the county of Allen and State of Kansas,have invented a new and useful Attachment for Drill-Wrenches, of whichthe followin g is a specification.

in screwing the sections together, so that a joint of sufficienttightness will be insured and disjointing of the drill-sections when inoperation will be prevented.

In the drawings forming a portion of this specification, and in whichlike numerals of reference indicate similar parts in the several views,Figure 1 is a top plan view of a wrench such as shown in the patent toForgie, above mentioned, and having the present pressure recording orindicating device attached there to. Fig. 2 is a side elevation of theindicator with its side plate partly removed to show the interiormechanism. Fig. 3 is a section on line 3 3 of Fig. 2. Fig. dis alongitudinal horizontal section of the indicator.

Referring now to the drawings, there is shown a wrench including a rack5, whichis arcuate and which is disposed concentric with the drill-rodthat is to be uncoupled, and on the rack is disposed a slidable carriageprovided with a feed mechanism, including the lever 7 for urging italong over the rack, and engaged with one end of the carriage is theouter end of one of the wrench-bars 8, which I at its opposite end isfashioned to engage an angular portion of a member of the drill-rod inthe usual manner. Engaged with the section of the rod or with the drillbelow the first bar 8 is the gripping end of a second bar 9, theopposite end of which is projected radially of the rack and across therack for engagement with the indicator, so that when the carriage isoperated to screw up the joint in the usual manner the bar 9 will bepressed against the indicator, which will be operated to show thepressure applied. The indicator consists of a casing 10, at one end ofwhich is a foot 11, and this casing is disposed upon the rack, and thefoot is perforated to receive the pin 12 at the end of the rack to holdthe casing against movement longitudinally of the rack. The rack is of Tshape, and on the bottom of the casing are downwardly and inwardlydirected flanges 13, which engage around the flanges of the rack, sothat the casing may be slidably engaged with the end of the rack andwill be held against upward displacement. In the forward end of thecasing is a slot or opening 14, alining with which is a guideway 15within the casing, formed by the transverse web 16, and passed throughthe slot and the guideway is a sliding plate 17, the inner end of whichis disposed against the end of a helical spring 18 in the rear end ofthe casing, while the forward end of the plate projects from the forwardend of the casing and is concaved, as shown at 18 to receive the end ofthe wrench-bar 9. In theplate 17 is a longitudinal slot 19, and throughthis slot is passed a screw 20, engaged with the web 16 and with thecasing in the rear of the plate, and this screw limits the slidingmovement of the plate in both directions. In the side plate 20 of thecasing 10 is a slot 21, extending longitudinally thereof, and at oneside of the slot the side plate is marked with a scale 22, which istraversed by the index23 at the outer end of a stud 24, passed throughthe slot of the plate 20 and engaged withthe plate17. The index standsnormally at the outer end of the scale; but in the operation of thedevice as the pressure of the bar 9. is applied to the plate 17 thelatter moves into the casing, and by properly graduating the scale theamount of pressure applied maybe accurately determined. Couplings ofdifierent diameters require different degrees of pressure to engage themsecurely,

a recessed end projecting from said casing to receive a Wrench-bar,means for holding the plate yieldably against movement, an index carriedby the plate, a scale upon the casing in operative relation to theplate, and means for operating the other wrench-bar.

2. An indicating attachment for drill- Wrenches, comprising incombination with the bars constituting the Wrench, a casing having aslotted end and provided with means for attachment to the segment-rackof the Wrench, a plate slidably disposed in the slot of the easing andhaving a recessed outer end to receive one of the wrench-bars, saidcasing having a slot in its side, a stud connected with the plate andextending through the slot in the side of the casing, an index carriedby the stud, a scale marked upon the casing adjacent to the index andmeans for operating the other Wrench-bar.

3. A pressure-indicating attachment for drill-wrenches comprising acasing provided at its base with inwardly-directed flanges to engage awrench-rack and with a foot adapted to receive a securing-pin, a slidearranged within said casing and having a projecting end to engage one ofthe wrench-bars, a yieldable support for the inner end of said plate, anindex carried by said plate and project- 1 ing through a slot in thecasing, and a scale upon the casing adjacent to said slot, substantiallyas set forth.'

4:. In a device of the class described, the combination of a casinghaving an opening at its front end and a guideway formed by atransverse. web Within the casing, a slide extending through the openingat the front end of the casing and through the guideway in the latter, ascrew extending through the Web forming the guideway and through alongitudinal slot in the sliding plate and into the opposite Wall of thecasing, a spring disposed in the rear end of the latter and bearingagainst the inner end of the sliding plate, and an index carried by thelatter, extending through a slot in the casing and cooperating with ascale upon the outside of the casing to indicate the amount of pressureexerted against the tension of the spring, substantially as set forth.

In testimony that I claim the foregoing as my own I have hereto affixedmy signature in the presence of two witnesses.

EDWIN CLARENCE MILLER.

Witnesses:

GEO. G. Fox, FRANK wool).

